it happened about 230 miles south of cairo. the police say the bus was crossing the tracks and the railroad crossing was knocked down when the train slammed into it. the country's transport minister has already resigned because of the incident. >> now to a developing story in the gaza strip. overnight israeli forces destroyed an office belonging to hamas's prime minister. no one was killed in the latest attack. israel has launched multiple air strikes since wednesday when it killed hamas's top israeli commander. israel says the attack is in response to missiles fired into israel from gaza. three israelis and 29 palestinians were killed in the back and forth rocket attack. president obama is staying in touch with israeli and egyptian leaders. israeli prime minister netanyahu called the president yesterday to provide an update of the situation. mr. obama also spoke with egyptian president morsi and praised his efforts to ease tensions in the region. the white house says president obama supports israel's right to defend itself but